src/HOL/TLA/Intensional.thy
author wenzelm
Wed Mar 04 19:53:18 2015 +0100 (2015-03-04)
changeset 59582 0fbed69ff081
parent 58950 d07464875dd4
child 60587 0318b43ee95c
permissions -rw-r--r--
tuned signature -- prefer qualified names;
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(*  Title:      HOL/TLA/Intensional.thy
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    Author:     Stephan Merz
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    Copyright:  1998 University of Munich
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*)
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section {* A framework for "intensional" (possible-world based) logics
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  on top of HOL, with lifting of constants and functions *}
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theory Intensional
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imports Main
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begin
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class world
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(** abstract syntax **)
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type_synonym ('w,'a) expr = "'w => 'a"   (* intention: 'w::world, 'a::type *)
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type_synonym 'w form = "('w, bool) expr"
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consts
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  Valid    :: "('w::world) form => bool"
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  const    :: "'a => ('w::world, 'a) expr"
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  lift     :: "['a => 'b, ('w::world, 'a) expr] => ('w,'b) expr"
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  lift2    :: "['a => 'b => 'c, ('w::world,'a) expr, ('w,'b) expr] => ('w,'c) expr"
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  lift3    :: "['a => 'b => 'c => 'd, ('w::world,'a) expr, ('w,'b) expr, ('w,'c) expr] => ('w,'d) expr"
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  (* "Rigid" quantification (logic level) *)
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  RAll     :: "('a => ('w::world) form) => 'w form"       (binder "Rall " 10)
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  REx      :: "('a => ('w::world) form) => 'w form"       (binder "Rex " 10)
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  REx1     :: "('a => ('w::world) form) => 'w form"       (binder "Rex! " 10)
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(** concrete syntax **)
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nonterminal lift and liftargs
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syntax
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  ""            :: "id => lift"                          ("_")
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  ""            :: "longid => lift"                      ("_")
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  ""            :: "var => lift"                         ("_")
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  "_applC"      :: "[lift, cargs] => lift"               ("(1_/ _)" [1000, 1000] 999)
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  ""            :: "lift => lift"                        ("'(_')")
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  "_lambda"     :: "[idts, 'a] => lift"                  ("(3%_./ _)" [0, 3] 3)
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  "_constrain"  :: "[lift, type] => lift"                ("(_::_)" [4, 0] 3)
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  ""            :: "lift => liftargs"                    ("_")
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  "_liftargs"   :: "[lift, liftargs] => liftargs"        ("_,/ _")
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  "_Valid"      :: "lift => bool"                        ("(|- _)" 5)
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  "_holdsAt"    :: "['a, lift] => bool"                  ("(_ |= _)" [100,10] 10)
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  (* Syntax for lifted expressions outside the scope of |- or |= *)
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  "_LIFT"       :: "lift => 'a"                          ("LIFT _")
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  (* generic syntax for lifted constants and functions *)
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  "_const"      :: "'a => lift"                          ("(#_)" [1000] 999)
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  "_lift"       :: "['a, lift] => lift"                  ("(_<_>)" [1000] 999)
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  "_lift2"      :: "['a, lift, lift] => lift"            ("(_<_,/ _>)" [1000] 999)
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  "_lift3"      :: "['a, lift, lift, lift] => lift"      ("(_<_,/ _,/ _>)" [1000] 999)
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  (* concrete syntax for common infix functions: reuse same symbol *)
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  "_liftEqu"    :: "[lift, lift] => lift"                ("(_ =/ _)" [50,51] 50)
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  "_liftNeq"    :: "[lift, lift] => lift"                ("(_ ~=/ _)" [50,51] 50)
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  "_liftNot"    :: "lift => lift"                        ("(~ _)" [40] 40)
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  "_liftAnd"    :: "[lift, lift] => lift"                ("(_ &/ _)" [36,35] 35)
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  "_liftOr"     :: "[lift, lift] => lift"                ("(_ |/ _)" [31,30] 30)
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  "_liftImp"    :: "[lift, lift] => lift"                ("(_ -->/ _)" [26,25] 25)
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  "_liftIf"     :: "[lift, lift, lift] => lift"          ("(if (_)/ then (_)/ else (_))" 10)
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  "_liftPlus"   :: "[lift, lift] => lift"                ("(_ +/ _)" [66,65] 65)
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  "_liftMinus"  :: "[lift, lift] => lift"                ("(_ -/ _)" [66,65] 65)
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  "_liftTimes"  :: "[lift, lift] => lift"                ("(_ */ _)" [71,70] 70)
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  "_liftDiv"    :: "[lift, lift] => lift"                ("(_ div _)" [71,70] 70)
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  "_liftMod"    :: "[lift, lift] => lift"                ("(_ mod _)" [71,70] 70)
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  "_liftLess"   :: "[lift, lift] => lift"                ("(_/ < _)"  [50, 51] 50)
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  "_liftLeq"    :: "[lift, lift] => lift"                ("(_/ <= _)" [50, 51] 50)
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  "_liftMem"    :: "[lift, lift] => lift"                ("(_/ : _)" [50, 51] 50)
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  "_liftNotMem" :: "[lift, lift] => lift"                ("(_/ ~: _)" [50, 51] 50)
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  "_liftFinset" :: "liftargs => lift"                    ("{(_)}")
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  (** TODO: syntax for lifted collection / comprehension **)
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  "_liftPair"   :: "[lift,liftargs] => lift"                   ("(1'(_,/ _'))")
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  (* infix syntax for list operations *)
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  "_liftCons" :: "[lift, lift] => lift"                  ("(_ #/ _)" [65,66] 65)
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  "_liftApp"  :: "[lift, lift] => lift"                  ("(_ @/ _)" [65,66] 65)
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  "_liftList" :: "liftargs => lift"                      ("[(_)]")
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  (* Rigid quantification (syntax level) *)
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  "_ARAll"  :: "[idts, lift] => lift"                    ("(3! _./ _)" [0, 10] 10)
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  "_AREx"   :: "[idts, lift] => lift"                    ("(3? _./ _)" [0, 10] 10)
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  "_AREx1"  :: "[idts, lift] => lift"                    ("(3?! _./ _)" [0, 10] 10)
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  "_RAll" :: "[idts, lift] => lift"                      ("(3ALL _./ _)" [0, 10] 10)
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  "_REx"  :: "[idts, lift] => lift"                      ("(3EX _./ _)" [0, 10] 10)
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  "_REx1" :: "[idts, lift] => lift"                      ("(3EX! _./ _)" [0, 10] 10)
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translations
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  "_const"        == "CONST const"
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  "_lift"         == "CONST lift"
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  "_lift2"        == "CONST lift2"
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  "_lift3"        == "CONST lift3"
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  "_Valid"        == "CONST Valid"
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  "_RAll x A"     == "Rall x. A"
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  "_REx x  A"     == "Rex x. A"
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  "_REx1 x  A"    == "Rex! x. A"
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  "_ARAll"        => "_RAll"
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  "_AREx"         => "_REx"
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  "_AREx1"        => "_REx1"
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  "w |= A"        => "A w"
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  "LIFT A"        => "A::_=>_"
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  "_liftEqu"      == "_lift2 (op =)"
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  "_liftNeq u v"  == "_liftNot (_liftEqu u v)"
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  "_liftNot"      == "_lift (CONST Not)"
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  "_liftAnd"      == "_lift2 (op &)"
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  "_liftOr"       == "_lift2 (op | )"
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  "_liftImp"      == "_lift2 (op -->)"
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  "_liftIf"       == "_lift3 (CONST If)"
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  "_liftPlus"     == "_lift2 (op +)"
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  "_liftMinus"    == "_lift2 (op -)"
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  "_liftTimes"    == "_lift2 (op *)"
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  "_liftDiv"      == "_lift2 (op div)"
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  "_liftMod"      == "_lift2 (op mod)"
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  "_liftLess"     == "_lift2 (op <)"
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  "_liftLeq"      == "_lift2 (op <=)"
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  "_liftMem"      == "_lift2 (op :)"
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  "_liftNotMem x xs"   == "_liftNot (_liftMem x xs)"
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  "_liftFinset (_liftargs x xs)"  == "_lift2 (CONST insert) x (_liftFinset xs)"
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  "_liftFinset x" == "_lift2 (CONST insert) x (_const {})"
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  "_liftPair x (_liftargs y z)"       == "_liftPair x (_liftPair y z)"
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  "_liftPair"     == "_lift2 (CONST Pair)"
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  "_liftCons"     == "CONST lift2 (CONST Cons)"
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  "_liftApp"      == "CONST lift2 (op @)"
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  "_liftList (_liftargs x xs)"  == "_liftCons x (_liftList xs)"
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  "_liftList x"   == "_liftCons x (_const [])"
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  "w |= ~A"       <= "_liftNot A w"
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  "w |= A & B"    <= "_liftAnd A B w"
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  "w |= A | B"    <= "_liftOr A B w"
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  "w |= A --> B"  <= "_liftImp A B w"
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  "w |= u = v"    <= "_liftEqu u v w"
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  "w |= ALL x. A"   <= "_RAll x A w"
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  "w |= EX x. A"   <= "_REx x A w"
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  "w |= EX! x. A"  <= "_REx1 x A w"
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syntax (xsymbols)
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  "_Valid"      :: "lift => bool"                        ("(\<turnstile> _)" 5)
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  "_holdsAt"    :: "['a, lift] => bool"                  ("(_ \<Turnstile> _)" [100,10] 10)
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  "_liftNeq"    :: "[lift, lift] => lift"                (infixl "\<noteq>" 50)
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  "_liftNot"    :: "lift => lift"                        ("\<not> _" [40] 40)
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  "_liftAnd"    :: "[lift, lift] => lift"                (infixr "\<and>" 35)
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  "_liftOr"     :: "[lift, lift] => lift"                (infixr "\<or>" 30)
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  "_liftImp"    :: "[lift, lift] => lift"                (infixr "\<longrightarrow>" 25)
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  "_RAll"       :: "[idts, lift] => lift"                ("(3\<forall>_./ _)" [0, 10] 10)
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  "_REx"        :: "[idts, lift] => lift"                ("(3\<exists>_./ _)" [0, 10] 10)
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  "_REx1"       :: "[idts, lift] => lift"                ("(3\<exists>!_./ _)" [0, 10] 10)
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  "_liftLeq"    :: "[lift, lift] => lift"                ("(_/ \<le> _)" [50, 51] 50)
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  "_liftMem"    :: "[lift, lift] => lift"                ("(_/ \<in> _)" [50, 51] 50)
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  "_liftNotMem" :: "[lift, lift] => lift"                ("(_/ \<notin> _)" [50, 51] 50)
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syntax (HTML output)
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  "_liftNeq"    :: "[lift, lift] => lift"                (infixl "\<noteq>" 50)
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  "_liftNot"    :: "lift => lift"                        ("\<not> _" [40] 40)
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  "_liftAnd"    :: "[lift, lift] => lift"                (infixr "\<and>" 35)
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  "_liftOr"     :: "[lift, lift] => lift"                (infixr "\<or>" 30)
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  "_RAll"       :: "[idts, lift] => lift"                ("(3\<forall>_./ _)" [0, 10] 10)
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  "_REx"        :: "[idts, lift] => lift"                ("(3\<exists>_./ _)" [0, 10] 10)
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  "_REx1"       :: "[idts, lift] => lift"                ("(3\<exists>!_./ _)" [0, 10] 10)
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  "_liftLeq"    :: "[lift, lift] => lift"                ("(_/ \<le> _)" [50, 51] 50)
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  "_liftMem"    :: "[lift, lift] => lift"                ("(_/ \<in> _)" [50, 51] 50)
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  "_liftNotMem" :: "[lift, lift] => lift"                ("(_/ \<notin> _)" [50, 51] 50)
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defs
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  Valid_def:   "|- A    ==  ALL w. w |= A"
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  unl_con:     "LIFT #c w  ==  c"
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  unl_lift:    "lift f x w == f (x w)"
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  unl_lift2:   "LIFT f<x, y> w == f (x w) (y w)"
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  unl_lift3:   "LIFT f<x, y, z> w == f (x w) (y w) (z w)"
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  unl_Rall:    "w |= ALL x. A x  ==  ALL x. (w |= A x)"
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  unl_Rex:     "w |= EX x. A x   ==  EX x. (w |= A x)"
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  unl_Rex1:    "w |= EX! x. A x  ==  EX! x. (w |= A x)"
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subsection {* Lemmas and tactics for "intensional" logics. *}
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lemmas intensional_rews [simp] =
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  unl_con unl_lift unl_lift2 unl_lift3 unl_Rall unl_Rex unl_Rex1
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lemma inteq_reflection: "|- x=y  ==>  (x==y)"
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  apply (unfold Valid_def unl_lift2)
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  apply (rule eq_reflection)
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  apply (rule ext)
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  apply (erule spec)
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  done
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lemma intI [intro!]: "(!!w. w |= A) ==> |- A"
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  apply (unfold Valid_def)
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  apply (rule allI)
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  apply (erule meta_spec)
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  done
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lemma intD [dest]: "|- A ==> w |= A"
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  apply (unfold Valid_def)
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  apply (erule spec)
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  done
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(** Lift usual HOL simplifications to "intensional" level. **)
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lemma int_simps:
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  "|- (x=x) = #True"
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  "|- (~#True) = #False"  "|- (~#False) = #True"  "|- (~~ P) = P"
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  "|- ((~P) = P) = #False"  "|- (P = (~P)) = #False"
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  "|- (P ~= Q) = (P = (~Q))"
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  "|- (#True=P) = P"  "|- (P=#True) = P"
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  "|- (#True --> P) = P"  "|- (#False --> P) = #True"
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  "|- (P --> #True) = #True"  "|- (P --> P) = #True"
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  "|- (P --> #False) = (~P)"  "|- (P --> ~P) = (~P)"
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  "|- (P & #True) = P"  "|- (#True & P) = P"
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  "|- (P & #False) = #False"  "|- (#False & P) = #False"
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  "|- (P & P) = P"  "|- (P & ~P) = #False"  "|- (~P & P) = #False"
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  "|- (P | #True) = #True"  "|- (#True | P) = #True"
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  "|- (P | #False) = P"  "|- (#False | P) = P"
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  "|- (P | P) = P"  "|- (P | ~P) = #True"  "|- (~P | P) = #True"
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  "|- (! x. P) = P"  "|- (? x. P) = P"
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  "|- (~Q --> ~P) = (P --> Q)"
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  "|- (P|Q --> R) = ((P-->R)&(Q-->R))"
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  apply (unfold Valid_def intensional_rews)
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  apply blast+
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  done
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declare int_simps [THEN inteq_reflection, simp]
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lemma TrueW [simp]: "|- #True"
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  by (simp add: Valid_def unl_con)
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(* ======== Functions to "unlift" intensional implications into HOL rules ====== *)
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ML {*
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(* Basic unlifting introduces a parameter "w" and applies basic rewrites, e.g.
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   |- F = G    becomes   F w = G w
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   |- F --> G  becomes   F w --> G w
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*)
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fun int_unlift ctxt th =
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  rewrite_rule ctxt @{thms intensional_rews} (th RS @{thm intD} handle THM _ => th);
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(* Turn  |- F = G  into meta-level rewrite rule  F == G *)
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fun int_rewrite ctxt th =
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  zero_var_indexes (rewrite_rule ctxt @{thms intensional_rews} (th RS @{thm inteq_reflection}))
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(* flattening turns "-->" into "==>" and eliminates conjunctions in the
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   antecedent. For example,
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         P & Q --> (R | S --> T)    becomes   [| P; Q; R | S |] ==> T
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   Flattening can be useful with "intensional" lemmas (after unlifting).
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   Naive resolution with mp and conjI may run away because of higher-order
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   unification, therefore the code is a little awkward.
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*)
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fun flatten t =
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  let
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    (* analogous to RS, but using matching instead of resolution *)
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    fun matchres tha i thb =
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      case Seq.chop 2 (Thm.biresolution NONE true [(false,tha)] i thb) of
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          ([th],_) => th
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        | ([],_)   => raise THM("matchres: no match", i, [tha,thb])
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        |      _   => raise THM("matchres: multiple unifiers", i, [tha,thb])
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    (* match tha with some premise of thb *)
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    fun matchsome tha thb =
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      let fun hmatch 0 = raise THM("matchsome: no match", 0, [tha,thb])
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            | hmatch n = matchres tha n thb handle THM _ => hmatch (n-1)
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      in hmatch (Thm.nprems_of thb) end
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    fun hflatten t =
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      case Thm.concl_of t of
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        Const _ $ (Const (@{const_name HOL.implies}, _) $ _ $ _) => hflatten (t RS mp)
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      | _ => (hflatten (matchsome conjI t)) handle THM _ => zero_var_indexes t
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  in
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    hflatten t
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  end
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fun int_use ctxt th =
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    case Thm.concl_of th of
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      Const _ $ (Const (@{const_name Valid}, _) $ _) =>
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              (flatten (int_unlift ctxt th) handle THM _ => th)
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    | _ => th
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*}
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attribute_setup int_unlift =
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  {* Scan.succeed (Thm.rule_attribute (int_unlift o Context.proof_of)) *}
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attribute_setup int_rewrite =
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  {* Scan.succeed (Thm.rule_attribute (int_rewrite o Context.proof_of)) *}
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attribute_setup flatten = {* Scan.succeed (Thm.rule_attribute (K flatten)) *}
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attribute_setup int_use =
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  {* Scan.succeed (Thm.rule_attribute (int_use o Context.proof_of)) *}
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lemma Not_Rall: "|- (~(! x. F x)) = (? x. ~F x)"
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  by (simp add: Valid_def)
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lemma Not_Rex: "|- (~ (? x. F x)) = (! x. ~ F x)"
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  by (simp add: Valid_def)
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end